<template>
  <div>
    <!-- 面包屑 -->
    <el-breadcrumb separator="/">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>商品分类</el-breadcrumb-item>
    </el-breadcrumb>
    <!--  -->
    <el-card>
      <el-row>
        <el-col>
          <el-button type="primary" @click="showAddCateDialog">添加分类</el-button>
        </el-col>
      </el-row>
      <!--  -->
      <tree-table
        class="treeTable"
        :data="catelist"
        :columns="columns"
        :selection-type="false"
        :expand-type="false"
        show-index
        index-text="#"
        border
      >
        <template slot="isok" slot-scope="scope">
          <i class="el-icon-success" v-if="scope.row.cat_deleted===false" style="color:lightgreen"></i>
          <i class="el-icon-error" v-else style="color:red;"></i>
        </template>
        <template slot="order" slot-scope="scope">
          <el-tag size="mini" v-if="scope.row.cat_level===0">一级</el-tag>
          <el-tag size="mini" type="success" v-else-if="scope.row.cat_level===1">二级</el-tag>
          <el-tag size="mini" type="warning" v-else>三级</el-tag>
        </template>
        <template slot="opt" slot-scope="scope">
          <el-button type="primary" size="mini" icon="el-icon-edit">编辑</el-button>
          <el-button type="danger" size="mini" icon="el-icon-delete" @click="delCate(scope.row.cat_id)">删除</el-button>
        </template>
      </tree-table>
      <!-- 分页 -->
      <el-pagination
        @size-change="handleSizeChange"
        @current-change="handleCurrentChange"
        :current-page="queryInfo.pagenum"
        :page-sizes="[3,5,10]"
        :page-size="queryInfo.pagesize"
        layout="total, sizes, prev, pager, next, jumper"
        :total="total"
      ></el-pagination>
    </el-card>
    <!-- 添加分类对话框 -->
    <el-dialog title="添加分类" :visible.sync="addCateDialogVisible" width="50%" @close="addCateDialogClosed">
      <el-form
        :model="addCateForm"
        :rules="addCateFormRules"
        ref="addCateFormRef"
        label-width="100px"
      >
        <el-form-item label="分类名称：" prop="cat_name">
          <el-input v-model="addCateForm.cat_name"></el-input>
        </el-form-item>
        <el-form-item label="父级分类：">
          <el-cascader clearable expand-trigger='hover' @change="parentCateChanged" v-model="selectedKeys" :options="parentCateList" :props="cascaderProps"></el-cascader>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addCateDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addCate">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  data() {
    return {
      // 商品分类的数据列表
      catelist: [],
      total: 0,
      // 查询条件
      queryInfo: {
        type: 3,
        pagenum: 1,
        pagesize: 5
      },
      // 为table指定列的定义
      columns: [
        {
          label: '分类名称',
          prop: 'cat_name'
        },
        {
          label: '是否有效',
          // 表示，将当前列定义为模板列
          type: 'template',
          // 表示当前这一列使用模板名称
          template: 'isok'
        },
        {
          label: '排序',
          // 表示，将当前列定义为模板列
          type: 'template',
          // 表示当前这一列使用模板名称
          template: 'order'
        },
        {
          label: '操作',
          // 表示，将当前列定义为模板列
          type: 'template',
          // 表示当前这一列使用模板名称
          template: 'opt'
        }
      ],
      // 控制添加分类对话框的显示与隐藏
      addCateDialogVisible: false,
      addCateForm: {
        cat_name: '',
        cat_pid: 0, //父级分类的Id
        cat_level: 0 //分类的等级，默认添加的是1级分类
      },
      addCateFormRules: {
        cat_name: [
          { required: true, message: '请输入分类名称', trigger: 'blur' }
        ]
      },
      //
      parentCateList: [],
      cascaderProps: {
        checkStrictly: true,
        label:'cat_name',
        value:'cat_id',
        children:'children'
      },
      // 选中的父级分类的id
      selectedKeys:[]
    }
  },
  created() {
    this.getCateList()
  },
  methods: {
    async getCateList() {
      const { data: res } = await this.$axios.get('categories', {
        params: this.queryInfo
      })
      if (res.meta.status !== 200) {
        return this.$message.error('获取商品分类数据失败')
      }
      this.catelist = res.data.result
      this.total = res.data.total
      // console.log(res.data.result)
    },
    // 监听pagesize改变
    handleSizeChange(newSize) {
      this.queryInfo.pagesize = newSize
      this.getCateList()
    },
    // 监听pagenum改变
    handleCurrentChange(newPage) {
      this.queryInfo.pagenum = newPage
      this.getCateList()
    },
    //
    showAddCateDialog() {
      this.getParentCateList()
      this.addCateDialogVisible = true
    },
    async getParentCateList() {
      const { data: res } = await this.$axios.get('categories', {
        params: { type: 2 }
      })
      if (res.meta.status !== 200) {
        return this.$message({
          message: '获取父级分类失败',
          type: 'error'
        })
      }
      this.parentCateList = res.data
      // console.log(this.parentCateList)
    },
    // 选择项发生变化触发
    parentCateChanged(){
        // console.log(this.selectedKeys)
        // 如果selectedKeys的length大于0，证明选中的父级分类，反之没有选中任何父级
        if(this.selectedKeys.length>0){
            // 父级分类的id , 数组中的最后一项是 父级id
            this.addCateForm.cat_pid = this.selectedKeys[this.selectedKeys.length-1];
            // 为当前分类的等级赋值
            this.addCateForm.cat_level = this.selectedKeys.length;
            return 
        }else{
            this.addCateForm.cat_pid = 0;
            this.addCateForm.cat_level = 0;
        }
    },
    //
    addCate(){
        this.$refs.addCateFormRef.validate(async valid=>{
            if(!valid) return;
            const {data:res} = await this.$axios.post('categories',this.addCateForm);
            if(res.meta.status!==201){
                return this.$message({
                    message: '添加分类失败',
                    type: 'error'
                });
            }
            this.$message({
                message: res.meta.msg,
                type: 'success'
            });
            this.getCateList();
            this.addCateDialogVisible = false;
            
        })
    },
    addCateDialogClosed(){
       this.addCateDialogVisible = false; 
       this.$refs.addCateFormRef.resetFields();
       this.selectedKeys = [];
       this.addCateForm.cat_id = 0;
       this.addCateForm.cat_level = 0;
    },
    // 删除分类
    async delCate(id){
        const {data:res} = await this.$axios.delete('categories/'+id);
        if(res.meta.status!==200) return this.$message.error('删除分类失败！')
        this.$message.success(res.meta.msg);
        this.getCateList();
    }
  }
}
</script>

<style lang="less" scoped>
.el-card {
  margin-top: 15px;
}
.treeTable {
  margin-bottom:15px;
  margin-top: 15px;
}
.el-cascader-panel{
    height: 240px;
}
.el-cascader{
    width:100%;
    .el-cascader-menu{
        height: 240px;
        overflow: auto;
    }
}

</style>